DR. GEMMY HANNSUN MD
NPI 1992120026
Radiology - Diagnostic Radiology in Orange, CA
About Dr. Gemmy Hannsun Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. GEMMY HANNSUN MD (NPI 1992120026) is an individual diagnostic radiology provider in Orange, California, licensed in California (A153743) and active in the NPI registry since February 2014. He is enrolled in Medicare PECOS, maintains a secondary practice location in Santa Ana, and is a graduate of University Of California, Davis School Of Medicine (2016).
NPPES Registry Identity
Specialties & Licenses
Secondary Practice Location 1
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Dr. Gemmy Hannsun Md is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignments
11Medicare enrollment records show Gemmy Hannsun reassigns Medicare billing to 11 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Orange, CA 92868
- Reassigned Medicare billing, California enrollment
- 202 clinicians in this Medicare group
Anaheim, CA 92801
- Reassigned Medicare billing, California enrollment
- Also billed through NPI 1093998122 (California), NPI 1962457812 (California)
- 349 clinicians in this Medicare group
San Diego, CA 92103
- Reassigned Medicare billing, California enrollment
- 360 clinicians in this Medicare group
Palm Desert, CA 92260
- Reassigned Medicare billing, California enrollment
- 278 clinicians in this Medicare group
Fresno, CA 93710
- Reassigned Medicare billing, California enrollment
- 232 clinicians in this Medicare group
Modesto, CA 95350
- Reassigned Medicare billing, California enrollment
- 219 clinicians in this Medicare group
Fremont, CA 94538
- Reassigned Medicare billing, California enrollment
- 238 clinicians in this Medicare group
Stockton, CA 95210
- Reassigned Medicare billing, California enrollment
- 219 clinicians in this Medicare group
San Francisco, CA 94118
- Reassigned Medicare billing, California enrollment
- 219 clinicians in this Medicare group
Sacramento, CA 95825
- Reassigned Medicare billing, California enrollment
- 220 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Areas of Expertise CMS Part B claims 20
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 92868 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Medicare Quality Performance CMS QPP · MIPS
Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.
Other Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
ORANGE, CA 92868
ORANGE, CA 92868
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is Gemmy Hannsun's NPI number?
The NPI number for Gemmy Hannsun is 1992120026. It was assigned to this individual provider in the NPPES registry on February 26, 2014.
Where is Gemmy Hannsun located?
Gemmy Hannsun practices at 101 The City Dr S, Orange, CA 92868. The listed phone number is (714) 456-8888.
What is Gemmy Hannsun's specialty?
The primary specialty registered for this NPI is Radiology, specializing in Diagnostic Radiology, with taxonomy code 2085R0202X.
Is Gemmy Hannsun enrolled in Medicare?
Yes. Gemmy Hannsun is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organizations bill Medicare for Gemmy Hannsun's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Gemmy Hannsun reassigns Medicare benefits to 11 organizations: Uc Regents (Orange, CA), Beverly Radiology Medical Group III (Anaheim, CA), Regents Of The University Of California (San Diego, CA), Desert Advanced Imaging Medical Center (Palm Desert, CA), Fresno Imaging Center (Fresno, CA) and 6 more organizations, listed in the Medicare section above. Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Gemmy Hannsun's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
When was this NPI record last updated?
The NPPES record for Gemmy Hannsun was last updated on January 20, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 9 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# Dr. Gemmy Hannsun, MD · NPI 1992120026
Diagnostic Radiology physician in Orange, California. Individual provider, active in the CMS NPPES registry since February 26, 2014.
## Identity
- **NPI:** 1992120026 (Entity type: Individual)
- **Enumerated:** February 26, 2014
- **Primary specialty:** Radiology - Diagnostic Radiology · taxonomy 2085R0202X
- **State license:** A153743 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 101 THE CITY DR S, Orange, CA 92868-3201
- **Phone:** (714) 456-8888
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 11 organizations under Medicare reassignment (form CMS-855R): Uc Regents (NPI 1346298528, Orange, CA); Beverly Radiology Medical Group III (NPI 1972826774, Anaheim, CA); Regents Of The University Of California (NPI 1558463927, San Diego, CA); Desert Advanced Imaging Medical Center (NPI 1568416147, Palm Desert, CA); Fresno Imaging Center (NPI 1659456499, Fresno, CA); and 6 more · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of California, Davis School Of Medicine, class of 2016
## Record status
- **NPPES last updated:** January 20, 2026
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Source: [NPI Profile](https://npiprofile.com/npi/1992120026) · Data from the CMS NPPES public registry.